Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bd45006eae8aeb…

MALICIOUS

PDF

78.7 KB Created: 2021-06-03 05:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0706c464d747af8107fdc90312d914e9 SHA-1: b3160b1ad294deab53f57464f44b4893a44e962f SHA-256: 98bd45006eae8aeb92b5aab914878a0e42cd37ece6d513f1ead98100d0129526
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/pbw?utm_term=what+level+is+b1+english+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379369/normal_604f6cfa328fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_605dd875d73ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_60272e5195910.pdfIn PDF document text
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/watawedegobunibuxebo.pdfIn PDF document text
    • https://lupobola.weebly.com/uploads/1/3/3/9/133999804/f0d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_606e11ce551cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gemometis.pbworks.com/f/mahabharat_star_plus_song_download.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/stick_fight_archer_mod_apk_unlimited_money.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144446577/how_to_read_crypto.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/w/file/fetch/144465231/thank_you_maam_answers.pdfIn PDF document text
    • http://kolelulu.pbworks.com/w/file/fetch/144417120/led_tv_service_manual_free_download.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/dark_souls_best_divine_weapons_reddit.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/wonivoxiv.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144413367/63768518767.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421266/what_is_the_fastest_way_to_solve_a_3x3_rubiks_cube.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144468891/the_day_after_tomorrow_hindi_dubbed_movie_download_300mb.pdfIn PDF document text
    • http://maxasol.pbworks.com/f/19245663334.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/dadex.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144469242/oxford_picture_dictionary_second_edition_free.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144421374/9768212217.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 5116 bytes
SHA-256: ea5792fbb7228e7ba65afe9370f453e2065e632c3cd092536f1798436b57355f
font_01_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 12652 bytes
SHA-256: 350eb6892968b26149287bedd6ffbaac798a856e327cc3f696af1a8654d9fbdb

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